[BUGFIX] allow to load unclean html without exception

fixes #754

src/PhpWord/Shared/Html.php

@@ -58,9 +58,8 @@ class Html
         // Load DOM
         $dom = new \DOMDocument();
         $dom->preserveWhiteSpace = true;
-        $dom->loadXML($html);
+        $dom->loadHTML($html, LIBXML_NOWARNING);       
         $node = $dom->getElementsByTagName('body');
-
         self::parseNode($node->item(0), $element);
     }